This figure shows the Windows scientific calculator. Under the header bar is a small toolbar with Edit, View and Help drop down menus. Next is the space where calculations selected in the calculator buttons are shown. Below that are a number of buttons allowing the choice of number system (such as binary or decimal, degrees or radians). Then the main calculator buttons are laid out in columns. To the left are scientific functions such as log and sin. To the right are numerals 0 – 9, plus, minus and so on.